What is the primary function of neutrophils and macrophages during inflammation?

• A. To facilitate the healing of blood vessels
• B. To phagocytize debris and microbes
• C. To secrete inflammatory mediators
• D. To form scar tissue

Answer: (B)

Neutrophils and macrophages play a crucial role in the inflammatory response, primarily through their function of phagocytizing debris and microbes. Phagocytosis is a process where these immune cells engulf and digest pathogens such as bacteria and viruses, as well as dead or damaged cells. This action is essential in containing infection and promoting tissue repair.

Neutrophils are typically the first responders to sites of inflammation, rapidly migrating to areas of infection or injury to initiate responses. They recognize pathogens through various receptors, undergo a process of ingestion, and subsequently destroy these pathogens using enzymes and reactive oxygen species.

Macrophages, which can be derived from monocytes that enter tissues, continue this process by phagocytizing remaining debris after neutrophils have done their initial job. Additionally, macrophages have the ability to present antigens to other immune cells, thus playing a pivotal role in linking the innate immune response with the adaptive immune response.

While healing of blood vessels, secretion of inflammatory mediators, and formation of scar tissue are all important aspects of the inflammatory response and related healing processes, the primary function of neutrophils and macrophages during the acute phase of inflammation is their direct role in phagocytosis. This is fundamental for